http://www.amazon.co.uk/Lexar-32GB-Micro-Speed-Reader/dp/B004BR2ZTM
I got one and can confirm that it is a vast improvement over the existing class 2 cards. I can finally put all 22ish GB of my music on my E72 and not have the music player slow down to an unusable rate! \o/
Just thought I'd share the good news 😊
(this prob isn't S60v3.2-specific but I found I couldn't post in some of the more apt general-purpose forums... mods, feel free to move this if you like)